As per the fare rules and codeshare agreements you can only route like the following:

Routing:
1. AV can only sell TPE-SFO/LAX/JFK stock or reverse so you have to connect onto one of the BR flights on this route.
2. TPE is the only destination that works, as AV has no access to connecting inventory after TPE to the rest of Asia.
3. You can route onto some UA flights instead of BR if you wish (with AV flight number) but also on the aforementioned routes and connecting cities between NA and TPE.
4. If originate in TPE is a little cheaper at 2050USD ish.
5. Unlimited stopover permitted but the price jumps by 3x, so not worth it. I did not see fare break information on ITA.

Mileage and fare class:
It is sold in K class from the AV inventory which is "discounted business"
even though K is coded as PY for BR and discount Y for UA. Your miles will be credited as AV flight in K class to Star Alliance FFPs.
Note some programme (like Aegean) still shows K class as Y for AV stock, so you will only get 100% miles, other programmes have updated, for example, OZ FFp shows K on AV as J class and awards 125% miles.

This fare is the usual price, so not a particular "deal". But is good price for year round.